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September 10, 1949, Vol 141, No. 2 >
ARTICLE | September 10, 1949

RATE OF BLOOD FLOW THROUGH NEEDLES

Norman M. Hornstein, M.D.
JAMA. 1949;141(2):148. doi:10.1001/jama.1949.02910020042022.
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ABSTRACT

To the Editor:—  In their article on the rate of blood flow through needles (The Journal, Aug. 6, 1949, page 1145), Brew and Dill quote Poiseuille's law to prove that the radius of the needle used in blood transfusions is of much greater importance than the pressure applied to the transfusion system in hastening the rate of flow. Their solution to the problem of massive transfusion required in serious hemorrhage and shock cases is therefore rather simple—to use a 15 gage needle.The use of a large needle would be the solution if the obstruction to flow in these serious clinical instances resided in the needle. However, the needle plays a minor role in the gravely diminished rate of transfusion encountered in the treatment of deeply shocked persons. The chief cause of obstruction to transfused blood is a contracture of the venous smooth muscle fibers. This cause is generally recognized

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